Solution : https://service.sap.com/sap/support/notes/37626 (SAP Service marketplace login required)
Key words : 
cat /tmp/split1 /tmp/split2 /tmp/split3 /tmp/split4 > newdata, hard disk client transport transports, <ibuf>               1       <cibuf>              1       <log_period>         20       <log_file>           stderr, buffer sizes                        <ibuf> <buf_size> = int, writing detailed log disabledfor internal, ]/tmp/split2        1332423/tmp/split3        2[, /tmp/split2        1332423/tmp/split3        2109464, =npipe &       r3chop -ecsf npipe > testdata, checksums---------r3chop calculates checksum information, -----------------------------------------------------------< file_name_1>       <size_1><file_name_2>       <size_2>
Related Notes : 
       
| 82225 | Importing tables from compressed dump files | 
| 67205 | CC-INFO: Copying large and productive clients | 
| 63693 | R3chop 30F version does not work with -Pf option | 
| 18236 | R3trans: Export to tape / Splitting the export |